Furnace



April w. H. MOSHER 1, 08,233

FURNACE Filed Dec. 13, 1926 "mum Ni In ven Z0);

E'etentcd Apr. 9, 1929.

PATENT OFFICE.

WILLIE-'1 H. MOfSl-IER, OF BUFFALO, NEW YORK.

FURNACE.

Application filed Becembcr 13, 1925. Serial No. 154,385.

This invention relates to improvements in iif object is the provision of an offurnace of this charac e3. which is so designed and constructed that the resistance or friction to the flow of hot gas in the rad ator l'lues practically equalize-s or balacres the chimney draft.

r-li'io'i'her object of the invention is to provide a furnace which has a comparatively long lluc travel for the hot gases, and which is oi? a minimum height to enable the use of steep and direct warm air pipes to the rooms to be heated.

Olhor objects are to provide a furnace of this type which is simple, compact and inexpens! re in construction, which can be readily adjusted to produce the best results, and which can be readily assembled and dismemin she accompanying drawings :Figm.c l a iron-t elevation oi: a furnace embodying tion.

Figure 2 a side clevm .I 'coi.

Figures 3 an d l are aorizontal the correspondingly numbered 1. Figure 5 is a transverse r m on line Fig, 1.

Similar characters of reference indicate oorrcs sending parts throughout the several views.

The outside casing or shell or": the furnace, which is preferably constructed of sheet metal and rreiaugular in s ape, consists of trout and rear walls and ll, side walls 12 and a top wall In its front wall 10 the casing has an opening 14 normally closed by a door 15 and below the same is an air inlet or opening 10.

Contaiuml within the front part of the and spaced from the rear, top and lo thereof is a lire box 17, which may lincwiz-ae be constructed oi: sheet metal, and is secured at its front end to the front wall 10 of said casing by suitable attaching flanges 18, as shownin Figs. 3 and l. This lire box has openings 19 and 20 which. register with the correspomling openings l l and 16 in the casing, and mounted within the box are burners 21 or equivalent heating elements The upper end of the lire lroi; terminates in a dome 22 from which leads an outlet pipe 23 for the products of combustion.

Surrounding the side walls and rear wall of? the lire box 17 and contained within the chamber 2% of the casing is a system of rediator lines which are so constructed and arranged that the chimney draft is turactically equalized by the resistance offered to the flow of hot gas 1: passing through such flues. To this end, a lower Ll-shaped flue 25 is provided which is disposed horizontally about the fire box and is supported in such position on suitable legs 26. Surmounting this flue is an upper flue consisting of two connected inner and outer sections 27 and 28 the outer section 27 being of the same s ape in plan as the lower flue 25 and the inner section 28 being more or loss squareshaped in top plan and circumscribing the outlet pipe of the fire box, as shown by dotted lines in Fig. 1. Both upper and lower lines are made from sheet metal pipe sections joined at the corners by suitable elbows 29 having radial lins 30 thereon, which not only increase the 'adiating area oi? the fines but also prevent the formation of eddy currents of air about the elbows. T hesc flucs coininmunicate with each other so that the hot gases pass through the upper line in one direction and through the lower flue in a counter direction. For this purpose, the lire box oijitlet pi e is connected with the innermost pipe-leg 31 of the upper flue-section 28 and the pipe-log 32 of the latter is joined to the opposing pipe-leg 33 of the companion outer flue section 27. The outermost pipe log 34; of the l: v joined by a conduit 35 with the adjoining pipe-leg of the lower flue 5Z5, wnile the legs 31, 38 and 34 oi? the upper flue and the 9 pipe-legs 3G and of the lower flue are closed by suitable covers 40. By this arrangement, a circuitous course for the products of combustion is orovided, the hot gases eliminated from the lire box passing in a counter-clockwise direction through the inner section 28 of the upper flue, then through the outer section 27 thereof and thence downwardly through the conduit 35 into the lower flue 25, through which it flows in a. counte' or clockwise direction to the chimney 39.

The 'adiator lines are preferably of the elongated cross-scction shown, with rounded top and bottom portions, which produce in 1* p l, s joined to the pipedeg 33 oi the outer s-Jection 27 0t suid l'lue. irrrunged within this conduit is :1 normally closed damper 4:3 whicn is only opened when sh, liing' the furnace for the purpone of heating; the chimney. The opening of the damper enables the hot, gases to How through the upper line and thenr.:e direiztly out through the chimney. As soon as the chimney is wormed sufiiciently to create a druit, the damper is closed, thereby (reusing the gases to low from the upper flue into the lower one and thence out through the chimney.

By arranging the radiator dues in the manner hereto'tore described, the resistance to the how of hot gases passing through them is such to nearly equal or balance the draft of the chimney with the result that the high friction nused by the rubbing etiect ot the hot euses in the lines produces u nuiximum transfer of bent to the flue-wells and thence to the surrounding air in the furnace casing. Every 'luruuce most cilicicnt nix some particular rate of heel; liow, and the present design may be easily and readily adapted to any rute of host tlo' by adjusting the length of the radiator lines and thus give "the proper resistance for that perticuhn' rate of bent production at. the burner. The iiues are mode longer for 21 greater consumption and shorter for it smaller eonsumption.

lfiurth rmore, the construction of this improved tin-now, is si .h thut it can be assembled in the iield by one man, and the entire lire box and radiator flue assembly may be repaired or removed without disturbing the worm :ur piping.

it will also be noted that the top and sides of the lire box l7 are exposed to the casing);- chumher 24c and the heat radiated therefrom is likewise utilized and conducted through the warm nir pipes 1-1 to the rooms. 7

I claim as my invention 1. A heating apparatus, comprising n cos- D 1 Ll Fa ing, a fire box arranged in said casing and spaced from the walls thereof to form a fluechzunber, seid fire box having an outlet in its top for the products of combustion, a chimney, a flue disposed in the upper portion of said chamber above the fire box and including interconnected inner and outer concentricully-arranged sections shaped to -form a circuitous spiral like path for the products of combustion, the inner section communicuting with the outlet of the fire box, end a second flue disposed in the lower portion of said chamber and connected at its inlet end to the outlet end of said firstnznned line and at its outlet end to the chimney.

2. A heating apparatus, comprising at cas ing, a lire box arranged in said casing and spaced from the walls thereof to form a finechumber, said fire-box having an outlet in its top for the products of combustion, a chimney, 2i flue disposed in the upper portion of said chamber over the fire box and inchiding interconnected inner and outer sections shaped to form a circuitous spiral like path for the products of combustion in one direct-ion, the inner section encircling the outlet end of the fire box and connected at its inlet end "hereto and the outer section being ll-sl'uiped. and having one leg thereof connected with the adjoining;- end of said inner section, and a second flue of U-shape disposed in the lower portion of said ch-nnher and partially surrounding said fire box for conduct ng the products of combustion in a direction counter to that of said firstnamed flue, one leg of said second flue being connected with the adjoining superposed leg of the outer section of said first-named flue and the other leg thereof communicating with the chimney.

3. A heating apparatus comprising a ing, a lire box arranged in said casing having an outlet, a, chimney, upper and lower lines of li -shape arranged in said casing and cminected with each other zit one end, conduits connecting the other ends of said tines with the chimney, and :L third flue arranged within and concentric with the upper flue and connected at one end with the lire box outlet and at its other end with said upper line, the combined lengths of the several lines being such as to resist the flow of hot gases therethru at a rate substantially equal to that of the chimney draft.

cas n d lVILLET H. MOSHER. 

